/*tooltip*/
.rTooltip {
    padding:4px;
    background:#000;
    position:absolute;
    z-index:1001;
    color:#fff;
    font-size:12px;
    filter:alpha(opacity=80);
    -moz-opacity:0.8;
    /** Firefox 3.5即将原生支持opacity属性，所以本条属性只在Firefox3以下版本有效 ***/
    -khtml-opacity: 0.8;
    opacity: 0.8;
}
.rTooltip .arrow {
    width:0;
    height:0;
    border-top:0px;
    border-bottom:5px solid #000;
    border-right:5px solid transparent;
    border-left:5px solid transparent;
    position:absolute;
    top:-4px;
    *top:-30px;
    left:8px;
}